144
Connecting to the Host’s RS-422A/485 Port
Section 5-2
Connecting an NT31/NT31C and a Host
The relay terminal block is not included in this figure. Insert the relay terminal block
so as to achieve the wiring configuration shown below.
RS-485
NT31/NT31C Host
Wiring when connecting a CS1-series CS1G/H serial communication board and
C series C200HX/HG/HE (–ZE) communication board
Applicable units:
CS1G-CPU42-E CS1G-CPU43-E
CS1G-CPU44-E CS1G-CPU45-E
CS1H-CPU63-E CS1H-CPU64-E
CS1H-CPU65-E CS1H-CPU66-E
CS1H-CPU67-E
C200HE-CPU32-(Z)E C200HE-CPU42-(Z)E
C200HG-CPU33-(Z)E C200HG-CPU43-(Z)E
C200HG-CPU53-(Z)E C200HG-CPU63-(Z)E
C200HX-CPU34-(Z)E C200HX-CPU44-(Z)E
C200HX-CPU54-(Z)E C200HX-CPU64-(Z)E
C200HX-CPU65-ZE C200HX-CPU85-ZE
1
14
13 25
NT31/NT31C side
Shielding wire
(25-pin type)
Abbreviation
FG
−
SD
RD
RS
CS
−
SG
−
TRM
RDB (+)
SDB (+)
−
−
−
SDA (−)
RDA (−)
−
−
RSB (+)
RSA (−)
−
Pin number
Connector
hood
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
−
23
24
25
RS-232C/
422A/485
connector
6
5
9
1
RS-422A
connector
Pin number
Connector
hood
1
2
3
4
5
6
7
8
9
Abbreviation
FG
SDA (−)
SDB (+)
−
−
−
RDA (−)
−
RDB (+)
−
(9-pin type)
Next PT
PC (CPU) side
In order to avoid an FG ground loop, do not connect the functional ground of the
NT31/NT31C to the shielding of the RS-485A cable.
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